Another just slightly different version is what I remember. It went like this:

A little bird
With a yellow bill
Was sitting on
My window sill
I coaxed him in
With a piece of bread
And then I crushed
His f***ing head

We ain't allowed to cuss in the Army no more.

Just kidding, but the DSs just about had an accident when I tried to lead my platoon in:

1-2-3-4
You can't count to 5
1-2-3-4
Cause your brain is fried.
On crack, and dope, and all that sh*t you smoke.
Crack baby, OHHH!